Optical scanner error compensator

Details Optical scanner error compensator Optical scanner error compensator

1986-04-25

1987-09-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250347, 356431, 358293, H04N 104, G01B 1126

Patent

active

046957227

ABSTRACT:
An optical projection system, e.g., an imaging infrared system, is compensated for errors caused by scan-to-scan jitter, framing jitter, vibrational effects, and scan nonlinearities. One or two closed control loops compensate for errors associated with mirrors (32, 52) of the optical projection system. In the scan control loop, a set of scan reference marks (75) in a reference plane (7) is superimposed onto a scan position detector (59) lying in a plane (10) containing a detector array (9), producing a scan error compensation signal (56). For wide scan fields of view (72), the scan position detector (59) comprises two pairs (94, 95) of triangular detectors, and means (86) for periodically switching therebetween. In the cross-scan control loop, a cross-scan reference mark (73) in the reference plane (7) is superimposed onto a cross-scan position detector (39), preferably comprising a pair of substantially identical triangular detectors (91, 92), lying in the detector plane (10), producing a cross-scan position error signal (36).

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